C++ MediaQuery类代码示例

bool MediaQueryEvaluator::eval(const MediaQuerySet* querySet, MediaQueryResultList* viewportDependentMediaQueryResults) const
{
    if (!querySet)
        return true;

    const WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> >& queries = querySet->queryVector();
    if (!queries.size())
        return true; // Empty query list evaluates to true.

    // Iterate over queries, stop if any of them eval to true (OR semantics).
    bool result = false;
    for (size_t i = 0; i < queries.size() && !result; ++i) {
        MediaQuery* query = queries[i].get();

        if (mediaTypeMatch(query->mediaType())) {
            const ExpressionHeapVector& expressions = query->expressions();
            // Iterate through expressions, stop if any of them eval to false (AND semantics).
            size_t j = 0;
            for (; j < expressions.size(); ++j) {
                bool exprResult = eval(expressions.at(j).get());
                if (viewportDependentMediaQueryResults && expressions.at(j)->isViewportDependent())
                    viewportDependentMediaQueryResults->append(adoptRefWillBeNoop(new MediaQueryResult(*expressions.at(j), exprResult)));
                if (!exprResult)
                    break;
            }

            // Assume true if we are at the end of the list, otherwise assume false.
            result = applyRestrictor(query->restrictor(), expressions.size() == j);
        } else {
            result = applyRestrictor(query->restrictor(), false);
        }
    }

    return result;
}

bool MediaQueryEvaluator::eval(const MediaListImpl* mediaList, CSSStyleSelector* styleSelector) const
{
    if (!mediaList)
        return true;

    const QList<MediaQuery*>* queries = mediaList->mediaQueries();
    if (!queries->size())
        return true; // empty query list evaluates to true

    // iterate over queries, stop if any of them eval to true (OR semantics)
    bool result = false;
    for (int i = 0; i < queries->size() && !result; ++i) {
        MediaQuery* query = queries->at(i);
        if (mediaTypeMatch(query->mediaType())) {
            const QList<MediaQueryExp*>* exps = query->expressions();
            // iterate through expressions, stop if any of them eval to false
            // (AND semantics)
            int j = 0;
            for (; j < exps->size(); ++j) {
                bool exprResult = eval(exps->at(j));
                if (styleSelector && exps->at(j)->isViewportDependent())
                    styleSelector->addViewportDependentMediaQueryResult(exps->at(j), exprResult);
                if (!exprResult)
                    break;
            }

            // assume true if we are at the end of the list,
            // otherwise assume false
            result = applyRestrictor(query->restrictor(), exps->size() == j);
        } else
            result = applyRestrictor(query->restrictor(), false);
    }

    return result;
}

bool MediaQueryEvaluator::eval(const MediaList* mediaList) const
{
    if (!mediaList)
        return true;

    const Vector<MediaQuery*>* queries = mediaList->mediaQueries();
    if (!queries->size())
        return true; // empty query list evaluates to true

    // iterate over queries, stop if any of them eval to true (OR semantics)
    bool result = false;
    for (size_t i = 0; i < queries->size() && !result; ++i) {
        MediaQuery* query = queries->at(i);

        if (mediaTypeMatch(query->mediaType())) {
            const Vector<MediaQueryExp*>* exps = query->expressions();
            // iterate through expressions, stop if any of them eval to false
            // (AND semantics)
            size_t j = 0;
            for (; j < exps->size() && eval(exps->at(j)); ++j) /* empty*/;

            // assume true if we are at the end of the list,
            // otherwise assume false
            result = applyRestrictor(query->restrictor(), exps->size() == j);
        } else
            result = applyRestrictor(query->restrictor(), false);
    }

    return result;
}

void LessMediaQuery::process(Stylesheet &s) {
  MediaQuery* query = s.createMediaQuery();

  query->setSelector(*getSelector());
  getContext()->processValue(query->getSelector());

  LessStylesheet::process(*query, *parent->getContext());
}

String MediaList::item(unsigned index) const
{
    if (index < m_queries.size()) {
        MediaQuery* query = m_queries[index];
        return query->cssText();
    }

    return String();
}

bool MediaQueryEvaluator::evalCheckingViewportDependentResults(const MediaQuerySet* querySet, Vector<std::unique_ptr<MediaQueryResult>>& results)
{
    if (!querySet)
        return true;

    auto& queries = querySet->queryVector();
    if (!queries.size())
        return true;

    bool result = false;
    for (size_t i = 0; i < queries.size() && !result; ++i) {
        MediaQuery* query = queries[i].get();

        if (query->ignored())
            continue;

        if (mediaTypeMatch(query->mediaType())) {
            auto& expressions = query->expressions();
            size_t j = 0;
            for (; j < expressions.size(); ++j) {
                bool exprResult = eval(expressions.at(j).get());
                if (expressions.at(j)->isViewportDependent())
                    results.append(std::make_unique<MediaQueryResult>(*expressions.at(j), exprResult));
                if (!exprResult)
                    break;
            }
            result = applyRestrictor(query->restrictor(), expressions.size() == j);
        } else
            result = applyRestrictor(query->restrictor(), false);
    }

    return result;
}

void MediaQueryRuleset::process(Stylesheet &s, Selector* prefix, ProcessingContext &context) {
  MediaQuery* query;
  Ruleset* target;
  Selector selector;

#ifdef WITH_LIBGLOG
  VLOG(2) << "Processing Less Ruleset: " <<
    getSelector().toString();
#endif
  
  query = s.createMediaQuery();
  selector = getSelector();
  context.interpolate(selector);

  if (query->getSelector().size() > 0) {
    selector.pop_front();

    query->getSelector().push_back(Token(" ", Token::WHITESPACE));
    query->getSelector().push_back(Token("and", Token::IDENTIFIER));
    query->getSelector().insert(query->getSelector().end(),
                                 selector.begin(),
                                 selector.end());
  } else
    query->setSelector(selector);

  if (prefix != NULL) {
    target = query->createRuleset();
    target->setSelector(*prefix);

#ifdef WITH_LIBGLOG
    VLOG(3) << "Interpolating selector " <<
    target->getSelector().toString();
#endif
    context.interpolate(target->getSelector());
  
    insert(NULL, *target, context);
  } else
    insert(NULL, *query, context);
}

//.........这里部分代码省略.........
            Nepomuk2::Variant value = resource.property(property);
            if (value.toResource().hasType(Nepomuk2::Vocabulary::NFO::Image())) {
                resource.removeProperty(property);
                resource.setProperty(mediaVocabulary.artwork(), value);
            }
        }
        property = QUrl("http://www.semanticdesktop.org/ontologies/nmm#genre");
        if (resource.hasProperty(property)) {
            Nepomuk2::Variant value = resource.property(property);
            resource.removeProperty(property);
            resource.setProperty(mediaVocabulary.genre(), value);
        }
        property = QUrl("http://www.semanticdesktop.org/ontologies/nmm#releaseDate");
        if (resource.hasProperty(property)) {
            Nepomuk2::Variant value = resource.property(property);
            resource.removeProperty(property);
            resource.setProperty(mediaVocabulary.releaseDate(), value);
        }
        property = Soprano::Vocabulary::Xesam::useCount();
        if (resource.hasProperty(property)) {
            Nepomuk2::Variant value = resource.property(property);
            resource.removeProperty(property);
            resource.setProperty(mediaVocabulary.playCount(), value);
        }
        property = Soprano::Vocabulary::Xesam::lastUsed();
        if (resource.hasProperty(property)) {
            Nepomuk2::Variant value = resource.property(property);
            resource.removeProperty(property);
            resource.setProperty(mediaVocabulary.lastPlayed(), value);
        }
        
        emit infoMessage(i18n("<b>Updating video types and properties</b><br>%1 video items done...", i));
        QApplication::processEvents();
    }


    //Fix screwed up properties
    MediaQuery query;
    QStringList bindings;
    bindings.append(mediaVocabulary.mediaResourceBinding());
    bindings.append(mediaVocabulary.ratingBinding());
    query.select(bindings, MediaQuery::Distinct);
    query.startWhere();
    query.addCondition(mediaVocabulary.hasTypeAnyAudio(MediaQuery::Required));
    query.addCondition(mediaVocabulary.hasRating(MediaQuery::Required, 10, MediaQuery::GreaterThan));
    query.endWhere();
    it = m_mainModel->executeQuery(query.query(), Soprano::Query::QueryLanguageSparql);
    emit infoMessage(i18n("<b>Updating audio types and properties</b><br>0 items updated..."));
    QApplication::processEvents();
    i = 0;
    while( it.next() && !m_stopUpdate) {
        QApplication::processEvents();
        i++;
        Nepomuk2::Resource resource = Nepomuk2::Resource(it.binding("r").uri());
        QUrl property = QUrl("http://www.semanticdesktop.org/ontologies/2007/08/15/nao#numericRating");
        if (resource.hasProperty(property)) {
            int rating = resource.property(property).toInt();
            if (rating > 10) {
                resource.removeProperty(property);
            }
        }
        emit infoMessage(i18n("<b>Cleaning up erroneous audio properties</b><br>%1 audio items done...", i));
        QApplication::processEvents();
    }

    MediaQuery query1;
    bindings.clear();
    bindings.append(mediaVocabulary.mediaResourceBinding());
    bindings.append(mediaVocabulary.ratingBinding());
    query1.select(bindings, MediaQuery::Distinct);
    query1.startWhere();
    query1.addCondition(mediaVocabulary.hasTypeAnyVideo(MediaQuery::Required));
    query1.addCondition(mediaVocabulary.hasRating(MediaQuery::Required, 10, MediaQuery::GreaterThan));
    query1.endWhere();
    it = m_mainModel->executeQuery(query.query(), Soprano::Query::QueryLanguageSparql);
    emit infoMessage(i18n("<b>Updating audio types and properties</b><br>0 items updated..."));
    QApplication::processEvents();
    i = 0;
    while( it.next() && !m_stopUpdate) {
        QApplication::processEvents();
        i++;
        Nepomuk2::Resource resource = Nepomuk2::Resource(it.binding("r").uri());
        QUrl property = QUrl("http://www.semanticdesktop.org/ontologies/2007/08/15/nao#numericRating");
        if (resource.hasProperty(property)) {
            int rating = resource.property(property).toInt();
            if (rating > 10) {
                resource.removeProperty(property);
            }
        }
        emit infoMessage(i18n("<b>Cleaning up erroneous video properties</b><br>%1 video items done...", i));
        QApplication::processEvents();
    }

    if (!m_stopUpdate) {
        emit infoMessage(i18n("<b>Update complete.</b>"));
    } else {
        emit infoMessage(i18n("<b>Update stopped.</b>"));
    }
    emit done();
}

void AudioStreamListEngine::run()
{
    QThread::setTerminationEnabled(true);
    m_stop = false;

    if (m_updateSourceInfo || m_removeSourceInfo) {
        NepomukListEngine::run();
        return;
    }
    
    //Create media list based on engine argument and filter
    QList<MediaItem> mediaList;
    MediaVocabulary mediaVocabulary = MediaVocabulary();
    
    QString engineArg = m_mediaListProperties.engineArg();
    QString engineFilter = m_mediaListProperties.engineFilter();
    
    if (m_nepomukInited) {
        if (engineArg.isEmpty()) {
            MediaQuery query;
            QStringList bindings;
            bindings.append(mediaVocabulary.mediaResourceBinding());
            bindings.append(mediaVocabulary.mediaResourceUrlBinding());
            bindings.append(mediaVocabulary.titleBinding());
            bindings.append(mediaVocabulary.ratingBinding());
            bindings.append(mediaVocabulary.descriptionBinding());
            bindings.append(mediaVocabulary.artworkBinding());
            //bindings.append(mediaVocabulary.genreBinding());
            query.select(bindings, MediaQuery::Distinct);
            query.startWhere();
            query.addCondition(mediaVocabulary.hasTypeAudioStream(MediaQuery::Required));
            query.addCondition(mediaVocabulary.hasTitle(MediaQuery::Required));
            query.addCondition(mediaVocabulary.hasRating(MediaQuery::Optional));
            query.addCondition(mediaVocabulary.hasDescription(MediaQuery::Optional));
            query.addCondition(mediaVocabulary.hasArtwork(MediaQuery::Optional));
            query.endWhere();
            QStringList orderByBindings;
            orderByBindings.append(mediaVocabulary.titleBinding());
            query.orderBy(orderByBindings);
            
            Soprano::QueryResultIterator it = query.executeSelect(m_mainModel);
            
            //Build media list from results
            while( it.next() ) {
                if (m_stop) {
                    return;
                }
                MediaItem mediaItem = Utilities::mediaItemFromIterator(it, QString("Audio Stream"), m_mediaListProperties.lri);
                if (!mediaItem.url.startsWith(QLatin1String("nepomuk:/"))) {
                    mediaList.append(mediaItem);
                }
            }
            
            m_mediaListProperties.summary = i18np("1 stream", "%1 streams", mediaList.count());
            
            MediaItem mediaItem;
            mediaItem.type = "Audio";
            mediaItem.url.clear();
            mediaItem.title = i18n("New Audio Stream");
            mediaItem.subTitle = i18n("Edit info to create new audio stream");
            mediaItem.artwork = KIcon("text-html");
            mediaItem.fields["title"] = i18n("Untitled");
            mediaItem.fields["audioType"] = "Audio Stream";
            mediaItem.fields["isTemplate"] = true;
            mediaList.append(mediaItem);
            
            m_mediaListProperties.type = QString("Sources");
            
        } else if (engineArg.toLower() == "search") {
            MediaQuery query;
            QStringList bindings;
            bindings.append(mediaVocabulary.mediaResourceBinding());
            bindings.append(mediaVocabulary.mediaResourceUrlBinding());
            bindings.append(mediaVocabulary.titleBinding());
            bindings.append(mediaVocabulary.ratingBinding());
            bindings.append(mediaVocabulary.descriptionBinding());
            bindings.append(mediaVocabulary.artworkBinding());
            //bindings.append(mediaVocabulary.genreBinding());
            query.select(bindings, MediaQuery::Distinct);
            query.startWhere();
            query.addCondition(mediaVocabulary.hasTypeAudioStream(MediaQuery::Required));
            query.addCondition(mediaVocabulary.hasTitle(MediaQuery::Required));
            query.addCondition(mediaVocabulary.hasRating(MediaQuery::Optional));
            query.addCondition(mediaVocabulary.hasDescription(MediaQuery::Optional));
            query.addCondition(mediaVocabulary.hasArtwork(MediaQuery::Optional));
            query.startFilter();
            query.addFilterConstraint(mediaVocabulary.titleBinding(), engineFilter, MediaQuery::Contains);
            query.addFilterOr();
            query.addFilterConstraint(mediaVocabulary.descriptionBinding(), engineFilter, MediaQuery::Contains);
            query.endFilter();
            query.endWhere();
            QStringList orderByBindings;
            orderByBindings.append(mediaVocabulary.titleBinding());
            query.orderBy(orderByBindings);
            
            Soprano::QueryResultIterator it = query.executeSelect(m_mainModel);
            
            //Build media list from results
            while( it.next() ) {
                MediaItem mediaItem = Utilities::mediaItemFromIterator(it, QString("Audio Stream"), m_mediaListProperties.lri);
//.........这里部分代码省略.........

void SemanticsListEngine::run()
{
    QThread::setTerminationEnabled(true);
    m_stop = false;

    if (m_updateSourceInfo || m_removeSourceInfo) {
        NepomukListEngine::run();
        return;
    }
    
    //Create media list based on engine argument and filter
    QList<MediaItem> mediaList;
    MediaVocabulary mediaVocabulary = MediaVocabulary();
    
    QString engineArg = m_mediaListProperties.engineArg();
    QString engineFilter = m_mediaListProperties.engineFilter();
    QStringList engineFilterList = m_mediaListProperties.engineFilterList();
    
    //Parse filter
    QString mediaType;
    QString groupByCategoryType;
    QString groupByField;
    QString limitFilter;
    int originalGenreLimit = 0;
    if (engineFilterList.count() != 0) {
        mediaType = engineFilterList.at(0);
        if (engineFilterList.filter("groupBy=").count() != 0) {
            QString groupByFilter = engineFilterList.filter("groupBy=").at(0);
            groupByField = groupByFilter.remove("groupBy=").trimmed();
            if (groupByField == "artist") {
                groupByCategoryType = "Artist";
            } else if (groupByField == "album") {
                groupByCategoryType = "Album";
            } else if (groupByField == "genre") {
                if (mediaType == "audio") {
                    groupByCategoryType = "AudioGenre";
                } else if (mediaType == "video") {
                    groupByCategoryType = "VideoGenre";
                }
            } else if (groupByField == "seriesName") {
                groupByCategoryType = "TV Series";
            } else if (groupByField == "actor") {
                groupByCategoryType = "Actor";
            } else if (groupByField == "director") {
                groupByCategoryType = "Director";
            } else if (groupByField == "tag") {
                if (mediaType == "audio") {
                    groupByCategoryType = "AudioTag";
                } else if (mediaType == "video") {
                    groupByCategoryType = "VideoTag";
                }
            }
        }
        if (engineFilterList.filter("limit=").count() !=0) {
            limitFilter = engineFilterList.filter("limit=").at(0);
            if (groupByField == "genre") {
                originalGenreLimit = m_mediaListProperties.filterValue(limitFilter).trimmed().toInt();
                int originalFilterIndex = engineFilterList.indexOf(limitFilter);
                limitFilter = QString("%1%2%3").arg(m_mediaListProperties.filterField(limitFilter))
                                               .arg(m_mediaListProperties.filterOperator(limitFilter))
                                               .arg(m_mediaListProperties.filterValue(limitFilter).trimmed().toInt()*3);
                engineFilterList.replace(originalFilterIndex, limitFilter);
            }
        }
    }
    
    if (m_nepomukInited) {
        if (engineArg.toLower() == "frequent") {
            mediaList.clear();
            if (mediaType == "audio" || mediaType == "video") {
                MediaQuery query;
                bool ignoreZeros = false;
                if (groupByCategoryType.isEmpty()) {
                    QStringList bindings;
                    bindings.append(mediaVocabulary.mediaResourceBinding());
                    bindings.append(mediaVocabulary.mediaResourceUrlBinding());
                    bindings.append(mediaVocabulary.playCountBinding());
                    query.select(bindings, MediaQuery::Distinct);
                    query.startWhere();
                    if (mediaType == "audio") {
                        query.addCondition(mediaVocabulary.hasTypeAnyAudio(MediaQuery::Required));
                    } else if (mediaType == "video") {
                        query.addCondition(mediaVocabulary.hasTypeAnyVideo(MediaQuery::Required));
                    }
                    query.addLRIFilterConditions(engineFilterList, mediaVocabulary);
                    if (m_mediaListProperties.filterForField("playCount").isEmpty()) {
                        query.addCondition(mediaVocabulary.hasPlayCount(MediaQuery::Required, 0, MediaQuery::GreaterThan));
                        ignoreZeros = true;
                    }
                    query.addCondition(mediaVocabulary.hasLastPlayed(MediaQuery::Optional));
                    query.endWhere();
                    QStringList orderByBindings;
                    QList<MediaQuery::Order> order;
                    orderByBindings.append(mediaVocabulary.playCountBinding());
                    order.append(MediaQuery::Descending);
                    orderByBindings.append(mediaVocabulary.lastPlayedBinding());
                    order.append(MediaQuery::Descending);
                    query.orderBy(orderByBindings, order);
                } else {
                    QStringList bindings;
//.........这里部分代码省略.........